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Nucle permit boundary. The first survey was conducted during April, 199D, and the second er during September, 1990. Both surveys involved visual ohservations for seeps and springs, and resulted in no discovery of any additional spoil seeps or springs within the surveyed area. The field equipment used for sampling conductivity and temperature at the NucLa Mine and Nucle East mining area (YSI conductivity meter) was tested for accuracy on April 11, 1990. the Nucle conductivity meter was calibrated by measuring [he conductivity of a 0.01 denial potassium chloride (KCl) solution at 25.1 degrees C. Based on the conductivity table for this solution at 25 degree C (YS1, 1979), the conductivity of the solution should theoretic~el ly be 1408.1 umhos/cm. The Nucle meter registered a conductivity of 1380 mhos/cm, or a 2 percent calibration error. the meter used to measure field-determined pN values et the Nucla Mine and Nucle East mining area is cal ibreted by performing two-point calibrations prior to each daily round of monitoring activities and one-point calibrations prior to each measurement using buffer solutions of known pH values obtained from outside laboratories. Three buffer solutions are used for calibration: t) pH 10; 2) pX 7 and 3) pN 4. The buffer solutions are replaced monthly to ensure accurate calibration of the meter. Most of the two point calibrations are performed by using the pH 7 and pH 10 buffer solutions, since the pli of most waters sampled at the Nucla and Nucla East Mines range between 7 and 9 pH units. However, the lower buffer solution (pH 4) is used for two f>oint calibrations prig- to measuring water historically known to exhibit pH values less then 7 pH units. One point calibrations involve using the pH 7 buffer solution. Table 3 presents the list of~ parameters used to analyze water quality samples obtained at surface water monitoring sites established et the Nucle Nine and Nucla Eest mining area during the 1990 water year. This parameter list will be used for analyzing surf ate water quality samples collected during the 1991 water year. Baseline Monitorinn Prouram - Nucle East. Surface water monitoring activities conducted since July of 1986 et monitoring sites established in and around Peabody's proposed wucla East mining area have been consistent with the approved baseline monitoring program (see Appendix 15.1, revised Nucla PAP). This program was proposed and outlined in a letter submitted to Mr. Steve Renner from Peabody personnel on April 21, 1996. Approval of the ' baseline monitoring program for the Nucla East mining areas was issued, with minor 8